How to Disable a GM Passkey System

by Herman Cruz
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Some GM vehicles come with a factory-installed anti-theft system commonly referred to as the passlock or passkey. Due to glitches with these built-in security systems, GM owners may experience problems trying to start their vehicles. When this happens, the security (theft sys) light randomly illuminates on the dashboard, and the car will not start. You can swiftly disable the passkey anti-theft system and get your GM started by performing the "relearn" procedure, which disables the passkey by resetting it.

Step 1

Insert your GM key into the ignition, attempt to start the car, and let it stall. After it stalls, leave the key in the starter in the "On" position. Do not turn the key to the "Off" position after you try to start it. When the key is in the "On" position, you are able to see all the lights on the dashboard, use the A/C and play the radio.

Step 2

Look at the "Theft Sys" light blinking on your dashboard and wait until the light stays on without blinking. This will take from 10 to 15 minutes.

Step 3

Start your car immediately after the "Theft Sys" light stops blinking. Your GM vehicle will now disable your passkey by resetting it and you will be able to start your car as usual.

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